| Definition/Meaning | Word/Phrase |
|---|---|
| very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois | chorioallantoic membrane , chorioallantois |
| one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta | chorionic villus |
| malignant neoplasm of the uterus derived from the epithelium of the chorion | trophoblastic cancer |